table of contents
v.lrs.where(1grass) | GRASS GIS User's Manual | v.lrs.where(1grass) |
NAME¶
v.lrs.where - Finds line id and real km+offset for given points in vector map using linear reference system.
KEYWORDS¶
vector, linear reference system, network
SYNOPSIS¶
v.lrs.where
v.lrs.where --help
v.lrs.where lines=name points=name
[llayer=string] [player=string]
[rsdriver=string] [rsdatabase=string]
rstable=string [threshold=float] [--help]
[--verbose] [--quiet] [--ui]
Flags:¶
Parameters:¶
- lines=name [required]
-
Name of input vector map
Input vector map containing lines - points=name [required]
-
Name of input vector map
Input vector map containing points - llayer=string
-
Layer number or name
Line layer
Default: 1 - player=string
-
Layer number or name
Point layer
Default: 1 - rsdriver=string
-
Driver name for reference system table
Options: dbf, mysql, odbc, ogr, pg, sqlite
Default: sqlite - rsdatabase=string
-
Database name for reference system table
Default: $GISDBASE/$LOCATION_NAME/$MAPSET/sqlite/sqlite.db - rstable=string [required]
-
Name of the reference system table - threshold=float
-
Maximum distance to nearest line
Default: 1000
DESCRIPTION¶
v.lrs.where identifies line id and real milepost+offset for points in vector map using linear reference system.
EXAMPLE¶
This example is written for the Spearfish dataset (it continues the example from v.lrs.create).
In this example, the ’route_lrs’ shall be queried
for unknown positions (points, stored in the map newpoints) along the
LRS:
# generate query points echo "590866.15|4926737.0 590933|4927133" | v.in.ascii out=newpoints v.lrs.where lines=route_lrs points=newpoints rstable=route_lrs pcat|lid|mpost|offset pcat|lid|mpost|offset 1|22|4.000000+212.091461 2|22|6.000000+188.112093 # verification g.region vector=route_lrs n=n+100 s=s-100 -p d.erase d.vect route_lrs d.vect busstops disp=attr attr=cat size=10 bg=white lcol=blue yref=bottom d.vect busstops icon=basic/circle fcol=blue d.vect newpoints col=red # measure distance to previous bus stop: # use measuring tool in graphical user interface
SEE ALSO¶
v.lrs.where, v.lrs.segment, v.lrs.label
LRS tutorial,
Introducing the Linear Reference System in GRASS
AUTHORS¶
Radim Blazek, ITC-irst/MPA Solutions
Documentation update (based on above journal article and available fragments):
Markus Neteler
SOURCE CODE¶
Available at: v.lrs.where source code (history)
Accessed: Saturday Jul 27 17:08:46 2024
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